A swivel joint connection in a cable tray installation requires which of the following?

• A. A flexible bonding jumper
• B. A rigid bonding jumper
• C. A grounding strap
• D. A sealant cap

Answer: (B)

Maintaining an electrical bond across metal cable tray joints is essential so all parts stay at the same potential and fault currents have a path to ground. Across a swivel joint, a rigid bonding jumper is used because it provides a solid, low-impedance connection that does not rely on a conductor designed to flex with movement. The joint can rotate, and a flexible jumper could fatigue, loosen, or fail over time as it bends and moves. A rigid jumper, properly clamped to both sides, keeps the bond continuous and dependable regardless of the joint’s position. The other options aren’t appropriate here: a flexible bonding jumper can suffer fatigue or looseness; a grounding strap is a flexible alternative not specified for this joint configuration; a sealant cap isn’t related to bonding or grounding.